Presentations using Quarto

Quarto presentation formats

revealjs - open-source HTML presentation format
beamer for LaTex slides
Powerpoint for when you have to collaborate via Office

`revealjs`

reveal.js is an open source HTML presentation framework. It’s a tool that enables anyone with a web browser to create fully-featured and beautiful presentations for free.

revealjs for Quarto is a framework for turning Pandoc-friendly markdown + code into beautiful slides
User guide: https://quarto.org/docs/presentations/revealjs/

Core workflow

---
format: revealjs
---

## Step 1
- Split slides up with level 2 headers: `## Heading 2`
- Add some markdown + text and/or some R/Python code

## Step 2
- quarto render

## Step 3
- Profit

Your Turn

Download usethis::use_course("cis-ds/reproducible-docs")
Open revealjs-penguins.qmd
Explore the code
Add a new slide with a level 2 header and some text
Render it!

YAML for these slides

---
format: 
  revealjs:
    slide-number: c/t
    width: 1600
    height: 900
    css: ["theme/theme.css"]
    theme: simple
    echo: true
---

Transitions

Transition	Description
`none`	No transition (switch instantly)
`fade`	Cross fade
`slide`	Slide horizontally
`convex`	Slide at a convex angle
`concave`	Slide at a concave angle
`zoom`	Scale the incoming slide so it grows in from the center of the screen.

---
title: "Presentation"
format:
  revealjs:
    transition: slide
    transition-speed: fast
---

Sizing

`width`	The “normal” width of the presentation, aspect ratio will be preserved when the presentation is scaled to fit different resolutions. Can be specified using percentage units.
`height`	The “normal” height of the presentation, aspect ratio will be preserved when the presentation is scaled to fit different resolutions. Can be specified using percentage units.

format:
  revealjs:
    height: 900
    width: 1600

Slide numbering

slide-number

Display the page number of the current slide

true: Show slide number
false: Hide slide number

Can optionally be set as a string that specifies the number formatting:

h.v: Horizontal . vertical slide number
h/v: Horizontal / vertical slide number
c: Flattened slide number
c/t: Flattened slide number / total slides (default)

---
format:
  revealjs:
    slide-number: c/t #< collapsed/total
---

Presentation preview

In the latest version of RStudio, Quarto revealjs presentations will open up as a “background job” in the Presentation tab.

Your Turn

Using RStudio, create a new revealjs Quarto presentation
Change YAML:
- author for your name
- titled “My first Quarto Presentation!”
- Add slide numbering (what do the different types mean?)
Write out what you did this morning (woke up, ate breakfast, walked to this room, etc) in sub-sections
New sections should have level 2 headers
Add a code chunk
Link out to an image with markdown syntax
Render it!

Separate slides

Level 2 header = new slide
Level 1 header = new slide and new section

--- can also delineate slides via horizontal rules or leave the heading “blank” for untitled slides

Reminder about pandoc div and spans

::: {.class}
<SOME CONTENT>
:::

Some text with a specific [span]{.span-class}

Lists

Create lists with - or * or 1.

Incrementally reveal elements with:

::: {.incremental}

- First item
- Second item

:::

Or affect globally:

format:
  revealjs:
    incremental: true

Or turn it off for specific lists

::: {.nonincremental}

- 1st Item
- 2nd Item

:::

Incremental lists

First item
Second item
Last item

Incremental reveal

Not limited to just bullet points…

Use . . . syntax to indicate a break at an arbitrary location

head(penguins)

## # A tibble: 6 × 8
##   species island    bill_length_mm bill_depth_mm flipper_l…¹ body_…² sex    year
##   <fct>   <fct>              <dbl>         <dbl>       <int>   <int> <fct> <int>
## 1 Adelie  Torgersen           39.1          18.7         181    3750 male   2007
## 2 Adelie  Torgersen           39.5          17.4         186    3800 fema…  2007
## 3 Adelie  Torgersen           40.3          18           195    3250 fema…  2007
## 4 Adelie  Torgersen           NA            NA            NA      NA <NA>   2007
## 5 Adelie  Torgersen           36.7          19.3         193    3450 fema…  2007
## 6 Adelie  Torgersen           39.3          20.6         190    3650 male   2007
## # … with abbreviated variable names ¹flipper_length_mm, ²body_mass_g

Incremental reveal

Not limited to just bullet points...

Use `. . .` syntax to indicate a break at an arbitrary location

. . .

```{{r}}
head(penguins)
```

Column layout

:::: {.columns}

::: {.column width="40%"}
contents...
:::

::: {.column width="60%"}
contents...
:::

::::

Column layout

On the left

On the right

Column layout

dplyr::glimpse(penguins)

## Rows: 344
## Columns: 8
## $ species           <fct> Adelie, Adelie, Adelie, Adelie, Adelie, Adelie, Adel…
## $ island            <fct> Torgersen, Torgersen, Torgersen, Torgersen, Torgerse…
## $ bill_length_mm    <dbl> 39.1, 39.5, 40.3, NA, 36.7, 39.3, 38.9, 39.2, 34.1, …
## $ bill_depth_mm     <dbl> 18.7, 17.4, 18.0, NA, 19.3, 20.6, 17.8, 19.6, 18.1, …
## $ flipper_length_mm <int> 181, 186, 195, NA, 193, 190, 181, 195, 193, 190, 186…
## $ body_mass_g       <int> 3750, 3800, 3250, NA, 3450, 3650, 3625, 4675, 3475, …
## $ sex               <fct> male, female, female, NA, female, male, female, male…
## $ year              <int> 2007, 2007, 2007, 2007, 2007, 2007, 2007, 2007, 2007…

Output location, `column-fragment`

library(ggplot2)

penguins %>% 
  ggplot(aes(x = body_mass_g, y = flipper_length_mm)) +
  geom_point() +
  geom_smooth(method = "loess", formula = "y~x")

## Warning: Removed 2 rows containing non-finite values (stat_smooth).

## Warning: Removed 2 rows containing missing values (geom_point).

Output location, `column`

library(ggplot2)

penguins %>% 
  ggplot(aes(x = body_mass_g, y = flipper_length_mm)) +
  geom_point() +
  geom_smooth(method = "loess", formula = "y~x")

## Warning: Removed 2 rows containing non-finite values (stat_smooth).

## Warning: Removed 2 rows containing missing values (geom_point).

Output location, `fragment`

library(ggplot2)

penguins %>% 
  ggplot(aes(x = body_mass_g, y = flipper_length_mm)) +
  geom_point() +
  geom_smooth(method = "loess", formula = "y~x")

## Warning: Removed 2 rows containing non-finite values (stat_smooth).

## Warning: Removed 2 rows containing missing values (geom_point).

Images

![](images/boston-sleep.png){fig-align="center"}

![](images/boston-sleep.png)

Images

::: columns
::: {.column width="50%"}
    ![](images/boston-sleep.png){fig-align="center"}

![](images/boston-sleep.png){fig-align="center"}
:::

::: {.column width="50%"}
    ![](images/boston-sleep.png)

![](images/boston-sleep.png)
:::
:::

Stack layout

Incremental reveal of images/content

Title Slide, YAML edition

---
format: revealjs
title: Hello Quarto
subtitle: Slides with revealjs
author: <a href="https://bensoltoff.com">Benjamin Soltoff</a>
date: 2022-10-04
institute: Cornell University
---

Tabsets

::: {.panel-tabset}

## Element 1

## Element 2

:::

Tabsets

Code

head(penguins)

Output

## # A tibble: 6 × 8
##   species island    bill_length_mm bill_depth_mm flipper_l…¹ body_…² sex    year
##   <fct>   <fct>              <dbl>         <dbl>       <int>   <int> <fct> <int>
## 1 Adelie  Torgersen           39.1          18.7         181    3750 male   2007
## 2 Adelie  Torgersen           39.5          17.4         186    3800 fema…  2007
## 3 Adelie  Torgersen           40.3          18           195    3250 fema…  2007
## 4 Adelie  Torgersen           NA            NA            NA      NA <NA>   2007
## 5 Adelie  Torgersen           36.7          19.3         193    3450 fema…  2007
## 6 Adelie  Torgersen           39.3          20.6         190    3650 male   2007
## # … with abbreviated variable names ¹flipper_length_mm, ²body_mass_g

Code

Code line-highlighting

Use #| code-line-numbers: "3" syntax - will highlight line and fade other lines

library(ggplot2)

penguins %>% 
  ggplot(aes(x = body_mass_g, y = flipper_length_mm)) +
  geom_point() +
  geom_smooth(method = "loess", formula = "y~x")

## Warning: Removed 2 rows containing non-finite values (stat_smooth).

## Warning: Removed 2 rows containing missing values (geom_point).

Code line-highlighting

Sometimes you want to make a point though…

library(ggplot2)

penguins %>% 
  ggplot(aes(x = body_mass_g, y = flipper_length_mm)) +
  geom_point() +
  geom_smooth(method = "loess", formula = "y~x")

## Warning: Removed 2 rows containing non-finite values (stat_smooth).

## Warning: Removed 2 rows containing missing values (geom_point).

Code line-highlighting

And I often want to “walk through” a set of code!

library(ggplot2)

penguins %>% 
  ggplot(aes(x = body_mass_g, y = flipper_length_mm)) +
  geom_point() +
  geom_smooth(method = "loess", formula = "y~x")

## Warning: Removed 2 rows containing non-finite values (stat_smooth).

## Warning: Removed 2 rows containing missing values (geom_point).

Themes/Appearance

https://quarto.org/docs/presentations/revealjs/themes.html

---
title: "Presentation"
format:
  revealjs: 
    theme: serif
---

---
title: "Presentation"
format:
  revealjs: 
    theme: dark
---

---
title: "Presentation"
format:
  revealjs: 
    theme: [default, custom.scss]
---

Websites using Quarto

Websites

Websites are essentially format: html + a Quarto Project

Website is different than format: html in that it has multiple pages
Website is our first exploration into Quarto Projects
- Similar to R Projects, but for Quarto!

Why not WordPress, Tumblr, Medium.com, Blogger.com, etc?¹

No Quarto support (even math support is often nonexistent or awkward)
Huge benefits of static websites compared to dynamic websites
all static files, no PHP or databases, no login/password, work everywhere (even offline)
typically fast to visit (no computation needed on the server side), and easy to speed up via CDN

RStudio > New Project > New Quarto Blog

Navigation & Structure

File	Description
`_quarto.yml`	Quarto project file.
`index.qmd`	Blog home page.
`about.qmd`	Blog about page.
`posts/`	Directory containing posts
`posts/_metadata.yml`	Shared options for `posts`
`styles.css`	Custom CSS for website

Create a blog

A blog is a website with specific “opinions” already made
Includes a listing automatically from posts directory
Can build custom listings in several ways

Core blog workflow

Create a new folder under /posts - this folder will be the “slug” URL (like bensoltoff.com/2022-07-25-new-post/)
Create a new index.qmd within the new folder

Your Turn

Create a new RStudio project (in a separate RStudio session) and select Quarto blog
Give it a name
Explore the directory

Rendering posts

On a specific post, Render with RStudio > Render
Build tab > Render/Preview Website

These will preview the entire website

When you render the website, it will re-execute code in older posts. Not ideal in many situations!

Your Turn

Let’s render the index.qmd together!
Now, let’s try Build > Render Website

Freeze

You can use the freeze option to denote that computational documents should never be re-rendered during a global project render, or alternatively only be re-rendered when their source file changes

execute:
  freeze: true  # never re-render during project render

execute:
  freeze: auto  # re-render only when source changes

freeze: true is typically added to a _metadata.yml file within a specific directory, affecting all files in that directory.

In the case of a blog - the _metadata.yml is saved at the root of the posts directory. You can have it only within specific subdirectories for more complex sites.

Cache

Cache on the other hand, stores the results of computations for a specific file.

Note that cache invalidation is triggered by changes in chunk source code (or other cache attributes you’ve defined).

execute:
  cache: true

I typically use cache throughout various types of outputs when I have computationally expensive chunks.

Your Turn

Render index.qmd in the project directory and note the items that are built
Explore the _freeze directory

Marvel at the “beautiful” JSON - it’s not for you, it’s for the machine

Themes

https://quarto.org/docs/websites/website-blog.html#themes

default, cerulean, cosmo, cyborg, darkly, flatly, journal, litera, lumen, lux, materia, minty, morph, pulse, quartz, sandstone, simplex, sketchy, slate, solar, spacelab, superhero, united, vapor, yeti, zephyr

To change theme, modify the bottom of your website’s _quarto.yml

format:
  html:
    theme: cosmo

Themes

Your Turn

Open _quarto.yml and change the theme to one of the support Bootswatch themes
Create a new folder in /posts/ - title it 2022-12-05-my-first-post
Create a new blank index.qmd in that folder, add a format: html YAML header
Add some text and a markdown image: ![](), along with maybe some code
Render it!

Adding an About page

twitter-card:
  image: images/profile-preview.png
  creator: "@soltoffbc"
open-graph: true
title: "Benjamin Soltoff"
image: images/profile-preview.png
about:
  template: trestles
  links:
    - icon: twitter
      text: Twitter
      href: https://twitter.com/soltoffbc
    - icon: github
      text: Github
      href: https://github.com/bensoltoff

About page templates

about:
  template: trestles

jolla

trestles

solana

marquee

broadside

Your Turn

Open your about page (about.qmd)
Change some of the details, add more details and choose a specific template (jolla, trestles, solana, marquee, broadside)
Render it!

Landing page

The landing page for your website defaults to the blog/listings page
your-proj/index.qmd becomes your “home page”

If you want your “About Me” page to be the landing page, rename your index.qmd -> blog.qmd and about.qmd -> index.qmd

Re-structuring your website also requires modifying your _quarto.yml

website:
  title: "My blog name"
  site-url: "https://MyBlogSiteUrl.com"
  navbar:
    right:
     - blog.qmd
     - icon: twitter
       href: "https://twitter.com/my_user_name"

Example: https://www.ericekholm.com/posts/demo-quarto-site/

Listings

Type	Description
default	A blog style list of items.
table	A table of listings.
grid	A grid of listing cards.

Listings

Default

By default, listings will appear in full width rows that display the item’s metadata (author and date), title, description, and image.

Grid

Grid style listings display a card for each item.

Table

The table listing style provides a traditional tabular layout.

Your Turn

Open your existing Quarto blog from before
Let’s change the listing type of our blog - change from default to grid
Re-render the index.qmd

Publishing

Destination	Description
GitHub Pages	Publish content based on source code managed within a GitHub repository. Use GitHub Pages when the source code for your document or site is hosted on GitHub.
RStudio Connect	Publishing platform for secure sharing of data products within an organization. Use RStudio Connect when you want to publish content within an organization rather than on the public internet.
Netlify	Professional web publishing platform. Use Netlify when you want support for custom domains, authentication, previewing branches, and other more advanced capabilities.
Other Services	Content rendered with Quarto uses standard formats (HTML, PDFs, MS Word, etc.) that can be published anywhere. Use this if one of the methods above don’t meet your requirements.

Publishing

Static Only

quarto R package: quarto::quarto_publish_???()

Code

Evaluate R/Python code and render on a schedule
RStudio Connect
rsconnect::deployDoc(quarto = "path/to/quarto")
- rsconnect::deployDoc(quarto = quarto::quarto_path())

Static Publish

quarto::quarto_publish_???()
- quarto_publish_site(server = "rstudioconnect.example.com")
- quarto_publish_doc(server = "rpubs.com")
- quarto_publish_app(server = "shinyapps.io")

Netlify

Cheat code: Netlify drop

GitHub Pages

Name your content index.qmd to generate index.html -> Push to GitHub

Step 2: Name your slides index.qmd pic.twitter.com/wLXN43rUlZ

— Emil Hvitfeldt (@Emil_Hvitfeldt) July 21, 2022

Websites

Similar to blog, but less of a focus on listing/posts and more focus on individual pages and overall navigation.

Quarto Project

https://quarto.org/docs/projects/quarto-projects.html

When you create a project, a _quarto.yml config file is created. Here is an example of what the _quarto.yml looks like:

project:
  output-dir: _output

toc: true
number-sections: true
bibliography: references.bib  
  
format: #< default format inherited by other documents
  html:
    css: styles.css

Quarto Projects

Minimal project has at least 1x file and 1x _quarto.yml
A project is a directory (and can have sub-directories)

A typical project is used to:

Aggregate content (website/blog/book)
Share metadata (YAML config) across multiple files
Render an entire directory together or redirect output to another directory
Freeze computation across a project or team

From Yihui: https://slides.yihui.name/2017-rmarkdown-UNL-Yihui-Xie.html#36 ↩︎

Publishing reproducible documents with Quarto

INFO 5940 Cornell University

Presentations using Quarto

Quarto presentation formats

revealjs

Core workflow

Your Turn

YAML for these slides

Transitions

Sizing

Slide numbering

Presentation preview

Your Turn

Separate slides

Reminder about pandoc div and spans

Lists

Incremental lists

Incremental reveal

Incremental reveal

Column layout

Column layout

Column layout

Output location, column-fragment

Output location, column

Output location, fragment

Images

Images

Stack layout

Title Slide, YAML edition

Tabsets

Tabsets

Code

Output

Code

Code line-highlighting

Code line-highlighting

Code line-highlighting

Themes/Appearance

Websites using Quarto

Websites

Why not WordPress, Tumblr, Medium.com, Blogger.com, etc?1

Navigation & Structure

Create a blog

Core blog workflow

Your Turn

Rendering posts

Your Turn

Freeze

Cache

Your Turn

Themes

Themes

Your Turn

Adding an About page

About page templates

jolla

trestles

solana

marquee

broadside

Your Turn

Landing page

Listings

Listings

Listings

Default

Grid

Table

Your Turn

Publishing

Publishing

Static Only

Code

Static Publish

Netlify

GitHub Pages

Websites

Quarto Project

Quarto Projects

INFO 5940
Cornell University

`revealjs`

Output location, `column-fragment`

Output location, `column`

Output location, `fragment`

Why not WordPress, Tumblr, Medium.com, Blogger.com, etc?¹